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We have synthetic scroll. But this feature doesn’t work
in google maps in desktop version. To move around the maps we need
to use click and drag on mouse. This CL adds only the background
functions for synthetic click and drag and unittests.
feature for telemety tests. In case of touch screens, the drag is
identical to synthetic scroll already implemented, except
for adding slop.

The functions of class synthetic_smooth_scroll_gesture is moved to
synthetic_smooth_move_gesture, with additional features of drag drop.
Classes synthetic_smooth_scroll_gesture and
synthetic_smooth_drag_gesture use the features with an instance of
synthetic_smooth_move_gesture.

In the next CLs The API and javascript interfaces will be added.

BUG=457148

Review URL: https://codereview.chromium.org/929333002

Cr-Commit-Position: refs/heads/master@{#318071}